Until it becomes illegal we are left with two choices:
Three choices. Choice three would be to ask those who make reproductions, particularly if they are members of this board, to please mark their reproductions accordingly. People looking for affordable wings for reenactment or as a place holder in a collection until an original can be obtained will buy them, even if they're marked as reproduction. Those wishing to pass them off as real will likely not buy them. I guess it comes down to what's more important - contributing good reproductions to fill a niche, or making money knowing full and well that a fair number of the items will be sold for a profit by unscrupulous people.
Jeff, who is NobleLoyalGSD on this board, makes very nice reproduction Vietnam-era patches. They look like the real deal. Yet Jeff goes out of his way to mark his pieces as reproductions, by using colored thread and actually putting R and the year he made the patch on the back. In my humble opinion, if you are a reputable dealer of reproduction items, you should mark them as such. If you don't mark them and are using original hallmarks (which may or may not be illegal), then it seems you are more interested in your profits, as you should know well that this is giving others the option of selling them as fake, and that many of them will end up in the hands of new or unsuspecting collectors thinking they were getting an original item. Were I making reproduction pieces, I would want to be certain that they will not be passed off as originals.